package com.itheima.mp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.metadata.OrderItem;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.baomidou.mybatisplus.extension.toolkit.Db;
import com.itheima.mp.domain.dto.PageDTO;
import com.itheima.mp.domain.po.Address;
import com.itheima.mp.domain.po.User;
import com.itheima.mp.domain.query.UserQuery;
import com.itheima.mp.domain.vo.AddressVO;
import com.itheima.mp.domain.vo.UserVO;
import com.itheima.mp.enums.UserStatus;
import com.itheima.mp.mapper.UserMapper;
import com.itheima.mp.service.IUserService;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import springfox.documentation.spi.service.contexts.Orderings;

import java.util.*;
import java.util.stream.Collectors;

@Service
public class  UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Override
    @Transactional
    public void deductBalance(Long id, Integer money) {
        //1、查询用户
        User user = getById(id);
        //2、校验用户状态
        if(user==null||user.getStatus()== UserStatus.FREEZE){
            throw new RuntimeException("用户状态异常");
        }
        //3、校验余额是否充足
        if(user.getBalance()<money){
            throw new RuntimeException("用户余额不足");
        }
        //4、扣减余额
        //baseMapper.deductBalance(id,money);
        int remainBalance=user.getBalance()-money;
        lambdaUpdate()
                .set(User::getBalance,remainBalance)
                .set(remainBalance==0,User::getStatus,UserStatus.FREEZE)
                .eq(User::getId,id)
                .eq(User::getBalance,user.getBalance())//乐观锁
                .update();
    }

    @Override
    public List<User> queryUsers(String name, Integer status, Integer minBalance, Integer maxBalance) {
        List<User> users = lambdaQuery()
                .like(name != null, User::getUsername, name)
                .eq(status != null, User::getStatus, status)
                .ge(minBalance != null, User::getBalance, minBalance)
                .le(maxBalance != null, User::getBalance, maxBalance)
                .list();

        return users;
    }

    @Override
    public UserVO queryUserAndAddressById(Long id) {
        //1、查询用户
        User user=getById(id);
        if(user==null||user.getStatus()==UserStatus.FREEZE){
            throw new RuntimeException("用户状态异常！");
        }
        //2、查询地址
        List<Address> addresses = Db.lambdaQuery(Address.class).eq(Address::getUserId, id).list();
        //3、封装VO
        //3.1转User的po为vo
        UserVO userVO= BeanUtil.copyProperties(user,UserVO.class);
        //3.2转地址vo
        if(CollUtil.isNotEmpty(addresses)){
            userVO.setAddresses(BeanUtil.copyToList(addresses, AddressVO.class));
        }

        return userVO;
    }

    @Override
    public List<UserVO> queryUsersAndAddressByIds(List<Long> ids) {
        //1、查询用户
        List<User> users=listByIds(ids);
        if(CollUtil.isEmpty(users)){
            return Collections.emptyList();
        }
        //2、查询地址
        //2.1获取用户id集合
        List<Long> userIds=users.stream().map(User::getId).collect(Collectors.toList());
        //2.2根据用户id查询地址
        List<Address> addresses=Db.lambdaQuery(Address.class).in(Address::getUserId,userIds).list();
        //2.3转换地址vo
        List<AddressVO> addressVOList=BeanUtil.copyToList(addresses,AddressVO.class);
        //2.4用户地址分组处理，相同用户的放入一个集合中
        Map<Long, List<AddressVO>> addressMap=new HashMap<>(0);
        if(CollUtil.isNotEmpty(addressVOList)){
            addressMap=addressVOList.stream().collect(Collectors.groupingBy(AddressVO::getUserId));
        }
        //3.转换vo返回
        List<UserVO> list=new ArrayList<>(users.size());
        for (User user : users) {
            //3.1转换User的po为vo
            UserVO vo= BeanUtil.copyProperties(user,UserVO.class);
            //3.2转换地址vo
            vo.setAddresses(addressMap.get(user.getId()));
            list.add(vo);
        }
        return list;
    }

    @Override
    public PageDTO<UserVO> queryUsersPage(UserQuery query) {
        String name=query.getName();
        Integer status=query.getStatus();
        //1、构建分页条件
        Page<User> page=query.toMpPageDefaultSortByUpdateTime();
        //2、分页查询
        Page<User> p=lambdaQuery()
                .like(name!=null,User::getUsername,name)
                .eq(status!=null,User::getStatus,status)
                .page(page);
        //3、封装VO结果
        return PageDTO.of(p,user -> {
            //1、拷贝基础属性
            UserVO vo= BeanUtil.copyProperties(user,UserVO.class);
            //2、处理特殊逻辑,例如，隐藏用户姓名后两位
            vo.setUsername(vo.getUsername().substring(0,vo.getUsername().length()-2)+"**");
            return vo;
        });
    }
}
